/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.support.lib.universal.qr.portrait.code;

import java.util.Vector;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;

import com.android.support.lib.universal.R;
import com.android.support.lib.universal.qr.portrait.CaptureActivity;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.Result;

/**
 * This class handles all the messaging which comprises the state machine for
 * capture.
 * 
 * @author dswitkin@google.com (Daniel Switkin)
 */
public final class CaptureActivityHandler extends Handler {

	private static final String TAG = CaptureActivityHandler.class
			.getSimpleName();

	private CaptureActivity activity = null;
	private Activity activity2 = null;
	private final DecodeThread decodeThread;// 解码线程
	private State state;

	// 枚举当前的状态类型
	private enum State {
		PREVIEW, // 预览
		SUCCESS, // 成功
		DONE// 完成
	}

	public CaptureActivityHandler(CaptureActivity activity,
			Vector<BarcodeFormat> decodeFormats, String characterSet) {
		this.activity = activity;
		decodeThread = new DecodeThread(activity, decodeFormats, characterSet,
				new ViewfinderResultPointCallback(activity.getViewfinderView()));
		decodeThread.start();
		state = State.SUCCESS;

		// Start ourselves capturing previews and decoding.
		CameraManager.get().startPreview();
		restartPreviewAndDecode();
	}

	@Override
	public void handleMessage(Message message) {
		int id = message.what;
		if (id == R.id.auto_focus) {
			if (state == State.PREVIEW) {
				CameraManager.get().requestAutoFocus(this, R.id.auto_focus);
			}
		}
		if (id == R.id.restart_preview) {
			restartPreviewAndDecode();
		}
		if (id == R.id.decode_succeeded) {
			state = State.SUCCESS;
			Bundle bundle = message.getData();
			Bitmap barcode = bundle == null ? null : (Bitmap) bundle
					.getParcelable(DecodeThread.BARCODE_BITMAP);
			activity.handleDecode((Result) message.obj, barcode);
		}
		if (id == R.id.decode_failed) {
			state = State.PREVIEW;
			CameraManager.get().requestPreviewFrame(decodeThread.getHandler(),
					R.id.decode);
		}
		if (id == R.id.return_scan_result) {
			if (activity != null) {
				activity.setResult(Activity.RESULT_OK, (Intent) message.obj);
				activity.finish();
			}
		}
		if (id == R.id.launch_product_query) {
			if (activity != null) {
				String url = (String) message.obj;
				Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
				intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
				activity.startActivity(intent);
			}

		}
	}

	// 退出同步
	public void quitSynchronously() {
		state = State.DONE;
		CameraManager.get().stopPreview();
		Message quit = Message.obtain(decodeThread.getHandler(), R.id.quit);
		quit.sendToTarget();
		try {
			decodeThread.join();
		} catch (InterruptedException e) {
			// continue
		}

		// Be absolutely sure we don't send any queued up messages
		removeMessages(R.id.decode_succeeded);
		removeMessages(R.id.decode_failed);
	}

	private void restartPreviewAndDecode() {
		if (state == State.SUCCESS) {
			state = State.PREVIEW;
			CameraManager.get().requestPreviewFrame(decodeThread.getHandler(),
					R.id.decode);
			CameraManager.get().requestAutoFocus(this, R.id.auto_focus);
			activity.drawViewfinder();
		}
	}

}
